what library to use for stoi keyword in c++

Question

my question is pretty simple but I can't seem to find it out. I want to know what libary to include when using stoi. I was using atoi and it works fine with

#include <iostream>
#include <string>
#include <stdlib.h>
using namespace std;

but I get "stoi not declared" when I run with stoi. Thanks

Show your code. `std::stoi` is actually declared in ``. Also, it was introduced in C++11, so that might be the problem. — cadaniluk, Oct 21 '15 at 13:03
`std::stoi` is a standard library *function*, not a keyword. A [keyword](http://en.cppreference.com/w/cpp/keyword) is something like `for` or `new`. — Some programmer dude, Oct 21 '15 at 13:04

score 1 · Answer 1 · answered Oct 21 '15 at 13:30

You need to #include <string> and use a compiler that understands C++11. Minimal example:

#include <string>
#include <cassert>

int main()
{
  std::string example = "1234";
  int i = std::stoi(example);
  assert(i == 1234);
  return 0;
}

Compile, for example, with g++ -std=c++11.

what library to use for stoi keyword in c++

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